-37.04% is the change from 270 to 170
Calculation steps:
[( 170 - 270 ) ÷ 270] x 100 = -37.04%
Formula
Percentage change = [(170 - 270) / 270] x 100
Subtract the new number by the original number
170 - 270 = -100
-100 ÷ 270 = -0.37037037037037035
-0.37037037037037035 x 100 = -37.04%